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Supply pipe

I am feeding two valves around my backyard. I live in a climate that has freezing temps all winter. Should I use poly pipe to feed these valves or use PVC? I heard that PVC will crack if the ground is heaved by frost even if the pipe has no water in it. How should I feed the valves? (100 ft away)

I would use NSF-rated poly pipe. Depending on your water pressure, you could use 125 psi or 160 psi, and pull the pipe like for a sprinkler system. The heavier the pipe wall, the more difficult it is to clamp. The "Loxon" strap clamps made by Ideal are strong enough for this. There are also brass compression fittings for poly pipe, made for the waterworks market. They are as reliable as they are expensive.